BSF Screw Plug Thread Gauges BSF Screw Ring Thread Gauges BSP LEFT HAND Screw Thread Gauges BSP Screw Plug Thread Gauges BSP Screw Ring Thread Gauges BSPT Screw Plug Thread Gauges BSPT Screw Ring Thread Gauges BSW Whitworth Screw Plug Thread Gauges BSW Whitworth Screw Ring Thread Gauges METRIC LEFT HAND Thread Gauges METRIC RIGHT HAND ISO Screw Plug Thread Gauges METRIC RIGHT HAND ISO Screw Ring Thread Gauges NPT / NPTF Screw Plug Thread Gauges NPT / NPTF Screw Ring Thread Gauges P.G Screw Plug Thread Gauges P.G Screw Ring Thread Gauges Special Order Thread Gauges UNC Screw Plug Thread Gauges Right & Left Hand UNC Screw Ring Thread Gauges Right & Left Hand UNEF Screw Plug Thread Gauges UNEF Screw Ring Thread Gauges UNF Screw Plug Thread Gauges Right & Left Hand UNF Screw Ring Thread Gauges Right & Left Hand UNJF Thread Plug Gauges UNS Screw Plug Thread Gauges UNS Screw Ring Thread Gauges